Transcript Maie - University of Hawaii at Hilo

Feeding performance of piscivorous gobioid
predator, Eleotris sandwicensis (O’opuAkupa)
Takashi Maie
Clemson University
Hawaiian Freshwater Stream Fauna
• Goby species
– Sicyopterus stimpsoni, O’opuNopili
– Lentipes concolor, O’opuAlamo’o
– Awaous guamensis, O’opuNakea
– Stenogobius hawaiiensis, O’opuNaniha
• Piscivorous gobioid predator
– Eleotrissandwicensis, O’opuAkupa
Entry to streams = Predation risk by Eleotris
Hawaiian Freshwater StreamFauna
• Goby species
– Sicyopterus stimpsoni, O’opuNopili
– Lentipes concolor, O’opuAlamo’o
– Awaous guamensis, O’opuNakea
– Stenogobius hawaiiensis, O’opuNaniha
• Piscivorous gobioid predator
– Eleotrissandwicensis, O’opuAkupa
Entry to streams = Predation risk by Eleotris
Does Eleotris predation have similar
impacts across goby populations?
Eleotrid Feeding
• SicyoperusvsAwaous as prey fish (Captured/Escaped)
• Contingency Table (one-tail)
Result (preliminary)
P = 0.0426
Captured (Eaten)
Escaped (Not eaten)
Awaous guamensis
29 (76.3%)
9 (23.1%)
Sicyopterus stimpsoni
54 (58.7%)
38 (41.3%)
Result (preliminary)
P = 0.0426
Captured (Eaten)
Escaped (Not eaten)
Awaous guamensis
29 (76.3%)
9 (23.1%)
Sicyopterus stimpsoni
54 (58.7%)
38 (41.3%)
Does Eleotris predation have similar
impacts across goby populations?
Result (preliminary)
P = 0.0426
Captured (Eaten)
Escaped (Not eaten)
Awaous guamensis
29 (76.3%)
9 (23.1%)
Sicyopterus stimpsoni
54 (58.7%)
38 (41.3%)
Does Eleotris predation have similar
impacts across goby populations?
NO!!
Result (preliminary)
P = 0.0426
Captured (Eaten)
Escaped (Not eaten)
Awaous guamensis
29 (76.3%)
9 (23.1%)
Sicyopterus stimpsoni
54 (58.7%)
38 (41.3%)
Does Eleotris predation have similar
impacts across goby populations?
NO!!
Sicyopterus – Retention time (36 hrs for metamorphosis) in
stream mouths prior to upstream migration
Predation Pressure by Eleotris – A driving force for
morphological change in Sicyopterus for better predator
evasion performance
Mahalo!
Bob Nishimoto, Darrel Kuamo’o, Lance
Nishiura, Tim Shindo, Troy Shimoda, Troy
Sakihara&Alysha Cabral (Hawai’i DAR, Hilo)
Blob lab, Kristine Moody (Clemson)
Schoenfuss lab (St. Cloud State)
NSF